80 70 England BIRTH RATE 1950-54 = 100 Italy Denmark Sweden U.S.A. Japan BIRTH RATE 1947 = 100 1947 1949 1951 1953 1955 1957 1959 1961 1963 1965 1967 Figure 7. Changes in birth rates in two sets of countries (base years-period when abortion policies were liberalized). Source: (123). amount of natality decline is related to the extent of liberalization. Japan has the most impressive decline. Next in magnitude of decline are the east European countries. In contrast, countries with restrictive abortion laws could not bring down their natality trend to the same extent within comparable periods of time. On the contrary, some of the countries showed a slight, though temporary, increase in the trend in the same period.derate in Chile. Yet, in spite of Chile's epidemic level of abortion during the past few decades, serious efforts to legalize abortion have been made only recently. The trend for New York City, while gradual and moderate, reveals a shrinking therapeutic abortion ratio which continues to be drastically lower than that in the other areas.